To localize the US-focused labels of some NPSP fields for a UK-based nonprofit, such as replacing "Organization" with "Organisation," the consultant should activate English (UK) in Language Settings. Here’s why:

Activate English (UK):

Salesforce supports multiple languages and localizations, including English (UK), which provides localized labels for standard fields and objects.

By activating English (UK), the system will automatically use British English conventions, replacing US-centric terms with UK equivalents.

This is a straightforward and efficient method to localize field labels without the need for custom development or manual label changes.